Cutting machine



xmga 3&11932. c, Q GRAY LSTS CUTTING MACHINE Filed July 195o :s sneeismef 1 W- 30 193g c.. B. GRAY 1,874,038

' CUTTING mcmNE Filed July 2', 1930 -3 Sheets-Sheet 2 wia/@QZ Aug., 3% i932. Q GRAY 'mr@ summe Mamma Fild July 2J, 1935) 3 Sheets-Sheet. 'ZS

.jas

- CUTTING Application led July-2,

My invention relatesto cutting machines of the reciprocatingv cutter type. 1 of J une 2,

1n my Patent No. 1,098,377, 1914, there is disclosed a `cutting machine having a reciprocatory cutter cooperating with a rotarycutter or die construction. The reciprocatory cutter is a. punch-like member or tool carried by a suitable reciprocatory holder or ram. The die construction consists H of a pair of spaced die 4feed-rollers and aninterposed die member. A presser roller resses material against. the die feed rollers and, if the latter are moved, material is fed. The: die feed rollers are actuated intermitf, tently and alternately with` cutting strokes of thereciprocatory cutter with the result that material is feder .advanced between cutting strokes. With a machine ofthis type, during the c-utting'stroke, the reciprocatory 9,, cutter orpunch tends `to force thevmaterial` backwardly; and, unless the die feed rollers are held without looseness or backlash, the machine does not `operate satisfactorily. This function has been performed byhold- 2:, ing pawls and by brakes; however, with such holding devices, it is` diilicult to secureiirm holding during `the cutting stroke, particularly with materialsof fairly heavy gage. An objectof my present invention isto pro,-

:;; vide an improved holdingdevice which will positively'hold the die feed rollersduring'the cutting stroke, this being achieved byvspecially modified intermittent` nism for the die'feed rollers. l l

More particularly, I provide a cam which imparts intermittent movement to the' Adie feed rollers, the cam having'a portion of constantradius anda portion whichfdecreases and then increases in radius, the rcam surface 4o of decreasing'radius providing for backward movement of a pawl and that of increasing radius providing Vforforward movement. f At the end. of such forward movement, the effective radius of the Ycam hasincreased until 45 the constant radius portion is. reached,

whereupon the mechanismis held while the cutting stroke takes place.v dwell period, the mechanism is under the tension or pull existing during the forward 50 or active portion of thek intermittent moveoperating mecha- Duringl this Y CHARLES B. GRAY, or MILLBOURNE, PENNsYLvANIA MACHINE f 1930. Serial No. 465,310.

ment with the result that there is no looseness or backlash during the cutting stroke even though there is looseness in the mechanism. A further object of my` inventionis toprovide a camin the intermittent mechanismV for the dieJ feed rollers which isconstructedand arrangedl both to secure the intermittent operation as well as to hold such mechanism during the cutting stroke.

A further object of my invention is to provide improved and simple means for releasing the pawl ofthe intermittent mechanism for securing the step-by-step feed.

further object is to lprovide a -ram and tool holder fory the reciprocatory tool vtoigether with a gag, which, when released,'perl v mits o f the holderand the tool carried theref and the construction of the machine becomes i' more economical. A further object of my invention vide an improved tool holder having means for adjusting the tool. l A further object is to provide a die feed roller construction having improved means of support andwherein the roller elements may be redressed when the shearing edges become Vspalled or V'dulled. l

A further object of my invention is to provide a` cutting machine capable of receiving a die either :of the feed roller type for straightcutting or of the roundtype for making curved cuts and templet cuts. Y A furtherobj ect of myinvention is to prois to prol `vide an improved tool particularly useful in cuttingtough metals, the tool having an yarcuate front cutting edge and a -back pilot tapered at opposite sidesfrom the'termini of the cutting edge downwardly( l These and other objects are effected by my invention as will be apparent .from the following description and claims taken from the accompanying drawings inf which: l

Fig. l is a fragmentary side elevational view of my improved cutting machine;

. Fig. la is a detail sectional view of the'cutter. feed `froll construction; l A

Fig. 2 is anend elevationalvie'wof the m'a- `chine shown in Fig. 1`; l l

throat space13. The' upper arm is providyto Fig. 2;

Fig. 3 is a fragmentary end elevationV viewed from the end of the machine opposite Figs. 6 and 7 are detail. views of .the`rarn;

Fig. 8 is a detail View f the tool iholding':

aggregate; Y i y Fig. 8a is a sectional view taken along the line 8a-8a of Fig. 8'; -v i :I Fig. 8,?) is a sectional view similar to Fig. 8a

but showing a toolholding element for a round tool;

" 9 isa further detail view of the appavtus vshown in Fig8; y

` Fig. 10 is a sectional detail viewof a round 4die holder and diewhich may be substituted yfor the diev construction shown in the preced- Iin'gviews;

F'0z11i a t'o lv"Y tli'e` lo th 1b S Sec l na 16N Mn ang e tail, -it preferably consists of al disk keyed f' Figs'12, 13 and 14 are detail views of*` a round tool. p Y l v A Referring now to the drawings more in detail, Ifshowja'frame 10 vhaving upper and 'lower arms f11 and'y 12, respectively, defining ed'with a reciprocating cutting tool 14 operated' from the power shaft 15 and the tool cooperates with die mechanism, at '16.

' Thedie mechanism, at 16, is preferably of v the cutter roll feed type,.that is, the die is comprised by a, pair Lof spaced Arollerclements 17, 17 and an intervening barvlike die member .18, the rollers and the' intervening' member fhaving` cutting edges 19 and 20,` respectively, which cooperate withthe cutting edges 21 and f2.2, respectively, of the tool .14.

' With the" present type vof machine, material is advancedv by the die cutter feedrolls17,

117. and' the yupper presser roller k23, feeding taking place betweencuttingstrokes of the tool 14'and the extentsof feeding being such f that vchipsfor slugs are successively removed in., order that asheet may be cut or slotted.

` 4, VThe diefeed rf'olls 17 17y are Aoperated in a ystep-by-step manner by vthe countershaft 25 to which is connected the ratchet wheel 26 actuated by the pawl 27.carried by the oscillatory arm 23 connected by a "link'29 to the lever .30pivoted at 31 and having a spring 32 which keeps the lever follower 33, for exam-4 ple, a roller,rk in engagement with the cam 34 v`keyed to the power shaft 15. The extent of vfeed mayv be.' varied by adjusting the lower and of the link 29 in or out 'along the arm 28 by the screw 35. v l

Heretofore, the countershaft has been loperated by an intermittentVv grip devicey and "holdingpawls or brakes have. been .used to hold the die feed rolls from backward movement due to the cutting action. The shearing action of the tool 14 results in a com.-

vponent of force tending to move the sheet being cut in a backward direction and this force is transmitted to the die feed rolls 17,

17. If the latter rolls are not restrained against movement, they will move. VThe hold- .Y in'gfmechanisrn should not have Vll'ooseness or backlash, and holding pawls and brakes have not lbeen entirely satisfactory, particularly with heavier 'gage material, for this reason. In accordance with the present invention, the countershaft 25 and the rolls 17, 17 are held rigidly or firmly'without backlash or looseness, not by auxiliary devices such as holding 'pawls or brakes, but by the special'character of transmission mechanism between the power'shaft 15 and the countershaft 25',.the cam' 34 having such a design that it actuates the mechanism intermittently and holds ating stroke of the pawl 247' engaging the ratchet wheel'26, the pawlis under ythe actuating pull or tension-and it is so heldV until it'reaches -b-. 'While the pawl is so held bythe portion of the cam of constant radius, ,y such pawl holds the ratchet wheel 26 and the rolls 17 17 against retrograde movement-and the` cutting stroke vtakes place during thisV period. With this, arrangement the die feed "rolls 17 ,1 17 arefirmly held even though the transmission'mechanism may have looseness therein. y Y

Feeding may bediscontinued at any time by the operator removing his foot from the treadle. To this end/the'p'a-wl has ai tail 37 lll connected to a cable 38 passing overa sheave V39 and having its lower end connected to the ,arm40 ofthe "treadle 41. v As soo'nas the op- `erator removes his foot from the treadle, the spring 42 *movesy the treadle and pulls the -cable 38 to release the pawl7 the cable including the spring 43 permitting` of movement of the treadle in casey the pawl cannot be instantaneouslyreleased, as would be the case when the pawl is under the load of feeding. When the load on l'the pawl is relieved,

Ithe spring 43 overcomes thepawl spring 44 to release the pawl. 4Feeding is aga-in started by the*l operator overcoming the spring '42, whereupon the pawl spring 44' maracas moves the pawl back to the position lwhere-it may engage the ratchet wheel.V

Withthis machine a clutch is unnecessary, a gag being used tof-move the tool 14 to iner-` fective position. III-the drawingsI show a ram 46 havingla guideway 47 and ram re-` taining strips 48.1secured to thev guideway.

. The ram vis provided with a cross slot 49 at lac shaft 15. VVlith rotationofthe abutment v on the ram-46 4lits the gag 56, the

latterpreferablybeingvbifurcated at57. A rod 58 is connected totheblock 54, passes up 'between the yfurcations 5,7, andthenlpasses Ythrough the opening 59 provided in the top portion of the ram. A spring 60 is arranged between the upper endof the ram and the outer end of the rod 58, a thimble 61'being disposed over the spring and serving as manual means for depressing the rod 58j against vthe compression of the spring. In operation, Athe thimble61 engages the remito'. produce a unitary structure assuring stripping of tool fromV stock. When the gag 1s in position, the spring 60 is undercompression,

and whenV the gag 56 `is pulled out by pulling on the button 62, the spring raises the tool relatively to the ram to 1inedective position.

rIhe tool holder aggregate is made up of the block 54, already referred to, having a'T- shaped opening 64 for the head ofthe screw 65e connected tok the lower'block 66, a soft metal locking member 67 being shown to lock the threaded connection. For a purpose to "be described, the lower block or tool holder has a dovetail :groove 68 to receive the dovetail shank 68aof the tool 14; By'turning the screw 65 the tool 14 may beradjustedu orV down. To secure further adjustment of? the tool, I provide a lug 69 on the block or 'holder 66 having ascrew 7 0 engaging either the top of the to'ol 14 or an-intervening filler block 71 ofv suitable length or thickness.

The die feed rolls17, 17 are carried by means permiting of ready detachment and dismantling. To this end, the rolllsupporting head or block 72 is connectedby holddown screws 73 tothe die bed portion 74 of the frame 10. The head or block 72 Yhas a bearing v74615 for the spindle 75 having a-collar 76 fitting against o-ne end of the bearing. At

the end of the spindle vremote from the collar Ythere is a reduced portion which 'receives the rolls'k17,"17, and nuts 78`hold the rolls' 17, 17 and the intervening collar or ring 79 in place with theinnermost roll 17 bearing against the other end of the bearing '74. The end `of the spindle adjacent-to the collar has ,a readily detachable coupling connectionV with respect to the countersh'aft' 25. For example,

I show the spindle provided witha diametral slot75a; receiving a tongue 756 on the countershaft. With this construction, the rolls 17,

`17 andthe intervening yring may be readily 'removed fromthe spindleupon removal of the nuts 78, and the entirearoll die head may be removed upon removal ,ofthehold-down bolts or screws 73, the coupling portions 7 5a yand 7 5b .permitting of readyjdisconnection of the spindle from the counter shaft 25.

Y The rolls 17, 17 and the `bar 18 are of special construction permitting of redressing or grinding down when the cutting edges become dulled orspalled. Adjacent sides of the rolls are recessed or counterbored at 80'- .'so as to overhang the ring or collar 7 9,-shims 81 preferably being arranged between the 'ring or collar 79 and the bottoms of the recesses or counterbores80. Not only may the adjacent faces ofthe rollsbe ground, suitable adjustment being madeby shims, but the collar may be made longenough to resist being battered down 'by the arcuate 'bearing portion 8.2'of the diebar 18. TheV bar 18 has a slot 18@ for the screw 18?, the latter connecting the 'bar to the head 72, whereby the bar may b e removed, replaced and adjusted.

"Owing to the die feed roll assembly being carried'by the shaft section 7 5 in an overhanging manner to facilitate assembly and dismantling of the roll elements, it is desirable toV provide' additional support for the roll assembly to oppose deflection-of the shaftsection due to cutting stresses.` To this end, I provide a pillow block and'slug ejector i 86 cooperating with 'the'ring 79'and a pillow member 102 cooperating with the periphery of the outerv roll element 17. Working stresses are transmitted from the rolls 17, 17

and the bar 18 to the ring 79 and fromvthe latter to the pillow member 86 as well'as from the outer roll element 17 directly to the pillow member 102. While I show these two means for affording support for the die roll assembly, it is to be understood that either. alone Vmay be suiiicient; however, when the outer pillow member 102 is relied upon entirely for this purpose, the member 86 is preferably mit stress directly from the ring 79 to the support, it will-be apparent that, as the roll elements 17, 17 and the spacing ring-7 9 fit the ilo retained for lejection purposes. While the j pillow and ejector member 86 serves to transshaft ysection 7 5 closely, deection of the lat- K ter will also be'resistedby the outer pillow member 1,02 and to assure this the ring 79 has la telescopic or spigot fit withrespect to the rolls 17, 17

The pillow and ejector member 86 is prefverably provided with an upper arcuate bearing surface 87 for cooperation with the spacingr'ing179, and one end 88 of the member 86 constitutes a slug or chip ejector. The member yor block 86 is held in place by a screw 865? and av wedge 86a is arranged beneath l.the block so that the arcuate bearing surface may be adjusted relatively to-` the ring 79.

The pillow member102 has its upper side curved to iit underneath the outermostI roll .17 Vand itis connected .tol the head `by a screw 103 and itis supported underneath by ay ledge construction 104.

The present 'machine 1s capable-of operated either as a roller diev shear or as a round tool shear. Y The roll die is advantageous in making straight or large or small radius curved cuts, and the round teol is useful in following a templet in that cuts of very small radii may be cut. The roll die head or block. 72 may be removed. from the die bed portion of the frame by removal of the holddown screws78 and replacedby alblock19-O having` openings 91 suitable for the holddown screws and providedl with around die 92.J W ith removal of the die rells17 17, the presser feed roller 28 cannotact as a feeding element; however, it may be raised land cooperate withl the stripper 93 to strip the round tool. As vthe presser feed roller 2d-,is arranged on the opposite sideotthetool 14 from the'stripper, it is in advantageous position to cooperate in the stripping function in connection with around tool. As the lower block of holder 65 has a dovetail groove 58 to receive the dovetail-shank 68a ot the tool,

the tool'and the presser roll 23` may be located.

'quite close to each otherwithout interfering with'treedornof movement of the tool.

` f v Where a round tool is used, 1 prefer to use a tool 98 havingl an arcuate front cutting edge 99 and a depending pilot portion 100the latter being tapered downwardly at opposite -sides from termini et the cutting` edge 99.

Asshown the cutting face bounded by the edge 99is substantially semi-circular and the pilot portion, except for the tapering, is substantially` semi-circularv in cross j section.

This form` of tool is particularly advanta geous in cutting tough metals-there is plenty of room in front of 'the pilot for displacement i of metal being sheared and the tapering pro- -vides roomfor corner flow and more .ready release from slugs, v A, l

When a round tool, such as shownin Figs.

V12,13 an'd14, is fused, the block orv tool holdabutting the lower end of the lspringy 110 and the lower end abiltting the cam ring 11 keyed to the stem 108 and provided with cam ele- 335 ments or faces lllacooperating with the cam Velements or faces .112 on the turnable member 113 having a handle 114. VThe turnable member 113 abuts the upperlend of thejspringV l115 and the lower .end of the latterbuts a shoulder 116 on the Vstem 108. Arnut 117 `carried by the upperv end of the stem 1,08

abuts the topend of the Vspring 1110.

The upper spring.110-servestopull the y presser roll assembly to the extent permitted by the stronger -spring 115 when the turnable member 113 is turned to bring the cam elements to releasing position, as shown in Fig When the 'cam elements are inreleasing position, there'is no compression in the spring 115 due thereto, the only compres- 1 sion being thatv dueto movement of the stem 108 'by the upper spring. Camming vdown of the upper end-oi the spring 115, overcomesl the upper spring 110` and .causesthezpresser roll assembly to lmove down, the roll engaging the stockjunder pressuredependent upon the strength of the-spring` 115 and the eX- Vtent ofcompression brought aboutby camming down. Hence the presser roll engages the stock under ydesired pressure,it may yield due to irregularities inthe stock, and maxiymumpressure is exerted Lat the right time,

that is, incident to engaging theroll with the stock. e j Y.. The presser roll assembly may be raised and lowered by adjusting the threaded sleeve 109 in the upper lug 106. Sulcient tension is placed inthe upper spring 110 to secure the desired raising effect-by adjustment of the nut v1,17, the latter having associated there-V with a jam nut 117ey to hold it inplace.

Hence the lpresserroll assembly maybe adljusted verticallyfor different. stock thicknesses, the presser roll may be raised by the upper 'spring 110 when permitted by the cam` elements,and theilower and stronger spring is effective, when compressed by thecam elements, to provide for yielding support for the presser roll. Y Y y Y vThe head 105 is also provided with a screw 120 arranged in the guide slot 121 of the stripper 93, 'the upper end-of the-stripper having a threaded connection withthe adjusting screw 122 carried byfthe lug'123 on the head and 'having a turning head 124. The screw 122 yisturned to raise or lowerthe stripper. 1t willbev seen that the frame head 105fis relatively simple in design considering that it carries `,the ram, the presser roll, and the stripper, theY presser roll and V"thestripper being Vcarried .by lugs on the head, whereby the head maybe readily cast and very little machining'be required forfthe operating parts. In addition, the arrangement ,of-parts iscompact and the parts areaccessible.l j Y, ,j

While I ,have shownv my inventionlin two forms, itwill'be obvious to those skilled in the. art that it issnot so limited, butis susceptible of variousother changes and modifican of, and I desire, therefore, that only-suchv limitations shall be placed thereuponasare` imposed-by the priorvartr or as'are specifically i set vforth in the appended claims. Y

v"WhatIclaim is: q* W ,I 1. The combination ofa cuttingfmachine having ycooperating rotary and `reciprocatory cutters, of mechanism forrotating the rotary cutter intermittently and-alternately with? cutting strokes ofthe reciprocatory cutter including a cam having anactuating portion anda holdingportion and means for reciproeating the reciprocatory cutter so thatfcutting strokes thereof take place -while the rotary cutter is held against movement in `a reverse direction by the holding portion of the cam. Vf2. The combination of a cutting machine having cooperating rotary and reciprocatory cutters, of apower shaft havingan eccentric for imparting reciprocatory movement tothe reciprocatory cutter, mechanism for rotating the rotary cutter intermittently including a cam having an actuating portion and a holding portion, and means 'for connecting, the cam to the power shaft so that-it is timed to hold the rotarycutter against movement in i a reverse direction during cutting strokes of the reciprocatory cutter.

3. The combination with a cutting machine having cooperating rotary and' reciprocatory cutters, of a power shaft havingan eccentric for imparting reciprocatory movement to the reciprocatory cutter, mechanism yfor `rotating the rotary cutter intermittently 1ncludingv a cam having @peripheral holding portion of constant 'radius and van actuating portion whose radius first .decreases rvfrom the constant radius and then increases tothe constant radius, and means vfor connecting the cam to thepower shaft sothat itis timed to hold the rotary cutter against'movem'ent in a reverse directionduring cutting strokes of .the reciprocatory cutter. Y f, 4:. The combination with a cutting machine having cooperating rotary and reciprocatory cutters, of a power'shaft having an eccentric for imparting reciprocatory movement to the reciprocatory cutter, a countershaft collS nected to the rotary cutter, a'ratchet wheel connected to the countershaft, an actuating Aand holding pawl 'cooperating withA thel ratchet wheel, means for moving the pawl in an oscillatory manner with respect to the aXis of the ratchet wheel and embodying la cam having a holding portion andan'actuating portion, and means for connectingthe cam to the power shaft so that itis timed Ito hold the rotary cutter against movement in a reverse direction`- during cutting strokes of the reciprocatory cutter. .1 5. The combination with a cutting machine having cooperating rotary andlreciprocatory cutters; of apower shaft having an eccentric for imparting recip'rocatorymovement 'to the reciprocatory cutter; a countershaft con'' nected to the rotary cutter; a ratchet wheel connected to the `countershaft; an actuating andY l,holding 4pawl cooperating with the ratchet wheel; and means for moving the ypawl in an oscillatory manner including a camf having a peripheralholding portion kof constant radius and a peripheral actuating portiony whichfirst decreases from the con-v stant radius and then increases to that-radius, a follQWerengaging the cam, a lever pivoted with respectto the ratchet'wheel axis, a link connecting the follower to the lever, ymeans for biasing the follower vint-o engagement with the cam, and. means for connecting the cam to theIpowe-r shaft so thatit is timed to hold the rotary cutter against movement ina reverse direction during cutting strokesfof the reciprocatory cutter.` Y f 6. VThe combination as claimed in claimt with means for varyingthe radius ofthe connectionofthe link with the lever.

'7. Thecombination with a cutting machine having va reciprocatory cutteig-rotary die feedv rolls,1and a presser roll cooperating with the die feed rolls to grip-andsecure feeding of a'l blank; 'of a power shaft khaving. an eccentric forv reciprocating the reciprocatory cutterf," a countershaft 'connected to klvfthe die fee'd rolls;fand `mechanism-for imparting intermittent Yrotarymotion to the counter-- shaft includinga cam having holding and actuating portions and means for connecting Vthe cam-,tothepower shaft in such timed relationV with respect `to'the eccentric thatthe rotary die rollsl are Vheld againstmovement in al reversedirection duringjcutting strokes of fthe reciprocatory cutter.; y y

8.-k Thecombination with a cutting machine having .areciprocatory cutter, rotary die feed Tolls, and a Apresser roll cooperatingv with the die feed rollsto grip, a blank and secure feeding ofthe latter; of a power shaft Y having an eccentric for `reciprocating the reciprocatory cutter.; a countershaft connected to the die feed rolls; and'mechanism for vimparting intermittent rotary motion to the ;countershaft includingV a. cam having holding and actuating portions, a follower cooperating ,withvthe cam,.a ratchet wheel "j connected to the countershaft', a leverpivoted with respect tothe ratchet wheel axis, a pawl pivoted` to vthe vlever and` cooperating Ywith the ratchet wheel, means forbiasing the pawl to engagethe.ratchet wheel, a linkyconnectf ing the follower and the lever, `and meansrfor connectingthe cam` to the pjower shaftin vsuch rtimedirelation with respect to the eccentric thatthe rotary die rolls lare held against movement ina reverse direction during cutting strokes of the reciprocatory cutter; and

means for moving'the .pawl to ineffective position 'including a cable connected to the pawl, atreadle connected tothe cable, and

means for biasingA the treadle in such a direc- 49, ciprocation, an abutment onfthe =ram,a gag `between the abutment and the tool holder' "55 ter; a die construction cooperating with the @5. anda pillow ymember disposed below oneof tion as to move the pawl to finetfecti've position. 9. `The combination as fclaimed'infclaim 8 wherein 421 Spring is incorporated inthe effec-A tivi@ length ofthe cable.y

Y 10. Ina cutting machine, a reciprocating cutter, a cooperating rotary cutterfincluding a pair of spaced and counterbored annular cutter members, Va ringiitting thef-'coun'ter-f l bores, a iXed cutter 'having its cutting end resting on the ring, andaspindle for supporting the annular cutter membersfand the intervening ring. i l Y 11. The combination as claimed in claim 10 with shimscooperating with the -r'ing to Y space the cutting edges of the cutter members aA predeterminedV distance apart;

12. The combination as claimed in claim 10 with a pillow member extending'between the cutter members and having'a supporting surface arranged underneath the ring; y

13. In a cuttingvmachine, a reciprocatory cutterQa die construction comprising a pair of spaced cutter feed `rolls 'and an interven` Y ing cutter bar, said cutter feed rolls having opposed counterbores, a ringfeXtending between the cutter feed rolls and into'the counterbores,a spindle supporting the cutter feed rolls andthe ring, said cutter bar having its cutting-end sustained by the upper portion of the ring, and a pillow member extending between the cutter feed rolls' and cooperating withfthe ring 'for sustaining working stresses imposed on the cutter feed rolls and having a defiector portion for ejectin'g slugs ory chips from between said rolls.' v

14. In a cutting machine, a reciprocatory ram, a tool holder carried byandmovable relatively to theramin the direction of recutter and including a pair of cutter-roll elements,a spacing lring element between the roll elements, and4 a'die bar havingfits 'cutting end resting on top of thespacing ring element; said cutter roll and the'spacing ring Y element being carried by and itted'to the overhanging portion of the spindle; means for reciprocating the' rcutter 'and for turning the lcutter rolljand spacing ring elements;

Vdle clutch portion.

saidA elements to limitfdeliection of the over? hanging portion of the spindledue to cut-`` tin'gstresses;

" 17;"In va cutting machine, a fframe, a. re-

ciprocatory cutterV carried by the frame, a

detachable head carried by thefr'ame and having bearingxmeans,.a spindle carriedby the bearing means and having a-'clutchvpore tion at one end, a diefconstructiou cooperating' with j. the vxreciprocatory Acutter and including a p airot spaced die cutter rolls car,,l ried by the spindle, and Apower means; or reciprocating the reciprocatory cutter and. forturning 'thedie cutter rolls and including a clutch portion for connection with-the spin-v 18. In a A cutting machine,VA cooperating SOI punch and .die members, 'a trame carrying the die member and provided with ahead having a; guideway, a ram fitting the guideway andcarrying the punch, Vlateral lug means carried by the head, a stem'carried by the lug means, a'fpresserroll carried by the lower end of the; stem-fand vdisposed adjacent to the punch, and means for raising and lowering the presserv roll including.V

spring'means eii'ective toV yieldingly urgethe stem and presser roll downward' 19. In a cutting machine, cooperating die,

and punch members, a frame carrying the die member and provided with a head hav-V ing a vertical guideway disposed above the die member, a ram fitting theguideway and carryingl the punch member,a stripper arranged adjacent to the punch, guide means orthe strippercarriedzbyV the head, anda screwcarried by thehead for raising and lowering the stripper.v l 4 e "Y f 20. Ina cutting machine, cooperating die andpunchv members, a presser roll arranged adjacent to the punch member, a spring 1associ'ated with the presser rollv to engage the latter with stock under pressure, means for compressing said springtocause the presser roll to engage-stockunder pressure, and'a springv for raising the/presser rollwhen said compressing meansV is released.l

21.`Al round tool for a cutting machine having arront cutting face boundedy by; an approximately semi-circular cutting edge whose'terminiare` at a back pilot which depends fromthe cutting face, the'pilot hav-yv ing its front face spaced approximately the tool radius. from the center of the cutting A edge and having its sides tapered downward,-

ly from the cutting` face so that guide edges lOG catory cutter and carried by said tool-holding portion, and a pillow member carried by the head and cooperating with said roll cutter Construction to resist Working stresses imposed on the latter.

In testimony whereof, I have hereunto subscribed my name this th day of June, 1930.

. CHARLES B. GRAY.

ler; 

